我想插入一个UITextField的文本。
这可能吗?
我想插入一个UITextField的文本。
这可能吗?
当前回答
我通常尽量避免子类化,但如果你已经:
// add a property
@property (nonatomic) UIEdgeInsets edgeInsets;
// and override:
- (CGRect)textRectForBounds:(CGRect)bounds
{
return [super textRectForBounds:UIEdgeInsetsInsetRect(bounds, self.edgeInsets)];
}
- (CGRect)editingRectForBounds:(CGRect)bounds
{
return [super editingRectForBounds:UIEdgeInsetsInsetRect(bounds, self.edgeInsets)];
}
其他回答
Swift 4.2版本:
import UIKit
class InsetTextField: UITextField {
let inset: CGFloat = 10
override func textRect(forBounds bounds: CGRect) -> CGRect {
return bounds.insetBy(dx: inset, dy: inset)
}
override func editingRect(forBounds bounds: CGRect) -> CGRect {
return bounds.insetBy(dx: inset, dy: inset)
}
override func placeholderRect(forBounds bounds: CGRect) -> CGRect {
return bounds.insetBy(dx: inset, dy: inset)
}
}
在从UITextField派生的类中,至少重写以下两个方法:
- (CGRect)textRectForBounds:(CGRect)bounds;
- (CGRect)editingRectForBounds:(CGRect)bounds;
如果你没有额外的内容,它可能就像这样简单:
return CGRectInset(bounds , 10, 10);
UITextField提供了几个可以覆盖的定位方法。
如果你想改变TOP和LEFT缩进只有这样
//占位符
- (CGRect)textRectForBounds:(CGRect)bounds {
CGRect frame = bounds;
frame.origin.y = 3;
frame.origin.x = 5;
bounds = frame;
return CGRectInset( bounds , 0 , 0 );
}
//文本位置
- (CGRect)editingRectForBounds:(CGRect)bounds {
CGRect frame = bounds;
frame.origin.y = 3;
frame.origin.x = 5;
bounds = frame;
return CGRectInset( bounds , 0 , 0 );
}
Swift 3 /可在界面构建器中设计/单独的水平和垂直昆虫/可用
@IBDesignable
class TextFieldWithPadding: UITextField {
@IBInspectable var horizontalInset: CGFloat = 0
@IBInspectable var verticalInset: CGFloat = 0
override func textRect(forBounds bounds: CGRect) -> CGRect {
return bounds.insetBy(dx: horizontalInset, dy: verticalInset)
}
override func editingRect(forBounds bounds: CGRect) -> CGRect {
return bounds.insetBy(dx: horizontalInset , dy: verticalInset)
}
override func placeholderRect(forBounds bounds: CGRect) -> CGRect {
return bounds.insetBy(dx: horizontalInset, dy: verticalInset)
}
}
用法:
&
重写-textRectForBounds:只会改变占位符文本的插入。要改变可编辑文本的插入,你还需要重写-editingRectForBounds:
// placeholder position
- (CGRect)textRectForBounds:(CGRect)bounds {
return CGRectInset(bounds, 10, 10);
}
// text position
- (CGRect)editingRectForBounds:(CGRect)bounds {
return CGRectInset(bounds, 10, 10);
}